You can change the date & time format in Google Sheets & Excel Online using this guide. Use different date & time formats in spreadsheets.

Use Microsoft Excel's TODAY() function in simple expressions to highlight the current date and past and future dates.

How to Auto-Format the Date in MS Excel. When you create Microsoft Excel spreadsheets that contain one or more columns of dates, you can make things a bit easier if you pre-format your cells to ...

Excel for the web now supports conditional formatting, and the interface is easier to use than the desktop edition. Susan Harkins shows you how to use it.

Excel's conditional formatting lets you formats cells based on the value of those cells or their formulas. Learn the basics of this amazing feature.